sounds like a defective nipple. Have never seen a nipple fail. Normal failure I see is that the spoke usually breaks right where it goes into the nipple or if installed incorrectly on the hub, it can sheer on the right angle turn into the hub.

Could the LBS have put way too much tension into all the spokes? Have them measure the tension on rest of the spokes. If its too tight, you may need to replace all the nipples. And if not corrected, you can split the flanges on the hub where the spoke goes into the hub failed hub photo

You may want to keep a cheap spare bike or set of wheels for emergency.

Do you have a ride to the LBS? I don't think you should ride with a way out of aligned wheel. You can potentially tweak the rims so it becomes ever so slightly pretzled.

Highly recommend that you get a ride to your LBS. Well I'm glad that you didn't get hurt. Bikes can be replaced/fixed.

ride safe,
Smilingcat